Major call 1

The EFS program can perform initialization processing such as opening data sets and obtaining storage.

Information is passed in both directions between DFSORT and the EFS program across the EFS interface.

At Major Call 1, DFSORT supplies your EFS program with fields in the EFS interface containing:

When the EFS program returns control to DFSORT, it can supply fields in the EFS interface containing:

A control statement request list, with a list of DFSORT and non-DFSORT control statement operation definers, or EXEC PARM options
Note: OUTFIL statements cannot be requested by an EFS program.
An EFS Program Context area (a private communication area for the EFS program)
A list containing messages for printing to the message data set
A return code (in general register 15).